06/08/2011 at 09:00 AM EDT
It's a girl for Jennifer Connelly and husband Paul Bettany!
The actress, 40, welcomed daughter Agnes Lark on May 31 in New York City, her rep confirms to PEOPLE.
The actress had a scheduled home water birth only three days after strolling with her family
in New York.
Their new addition joins big brothers Stellan, 7½, and Kai, 13, Connelly's son from her previous relationship with David Dugan.
The couple, who first met while filming A Beautiful Mind
and later wed in Scotland in 2003, confirmed the pregnancy